During the Renaissance, the Medici family in Florence, Italy wore purple. (6) Since Antiquity, the color of kings and emperors, but mostly nonexistent in Renaissance and Medieval era due to near extinction of the snail used to make imperial purple. Imperial purple disappeared in 1453.
1 cup water -- 1/2 cup oatmeal. 1.5 [one and one-half cups] water -- 3/4 cup of oatmeal. Twice as much water as oats. The oatmeal to water ratio of 2 to 1 works for rolled oats. For steel cut oats, the proportion is 4 to 1 -- 1 cup of water and 1/4 cup of steel cut oats.
Prepare the oatmeal. You can buy already prepared colloidal oatmeal for the bath, or you can make your own. To make your own, purchase rolled oats, not the instant cooking variety, from your grocery store. Place 1 cup (236 ml) of rolled oats into a food processor, blender or other grinding device.